<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>flex布局实例</title>
    <link rel="stylesheet" href="css/flex.css">
</head>
<body>
    <div class="box flex">
        <div class="box1">我是box1</div>
        <div class="box2">我是box2</div>
        <div class="box3">我是box3</div>
    </div>
</body>
</html>